11:15 - 12:15 |
Thiolate versus Selenolate: Structure, Stability and Charge Transfer Properties
Abstract: Selenolate is considered as an alternative to thiolate to serve as a headgroup mediating the formation of self-assembled monolayers (SAMs) on coinage metal substrates. There are however ongoing vivid discussions regarding the advantages and disadvantages of these anchor groups, regarding, in particular, the energetics of the headgroup-substrate interface and their efficiency in terms of charge transport/transfer. In this presentation I will present an overview of experiments aiming in addressing all these issues by comparing structure, stability and finally also conductance for thiols and selenols based SAMs. Of particular importance were comparable packing densities and molecular orientations in the studied systems, which, in our opinion, are indispensable prerequisites for reliable comparison of these two types of SAMs regarding structural quality, bond strength and transport properties. In view of the above aspects, optimization of the headgroup seems to be a promising, but not obvious, way to tune the structural and electronic properties of SAM-like molecular films.